Litigation Preparation Guide
How to Prepare for a Deposition: A Practical Guide for Witnesses
A deposition is sworn testimony given before trial, transcribed by a court reporter, and used as evidence later. It is your one chance to tell your story under oath — and what you say will be quoted, often out of context, in motions and at trial. The good news: most depositions are won or lost in the preparation, not in the room. This guide covers how to prepare, what to bring, how to answer, and the mistakes that hurt witnesses most.
Last updated: July 11, 2026 · Reading time: 8 min read
depositionlitigationwitness preparationlegal testimonydiscovery
What a Deposition Actually Is
A deposition is out-of-court sworn testimony, typically taken during the discovery phase of litigation. The witness is questioned by one or both sides' attorneys, the court reporter creates a verbatim transcript, and the transcript can later be used at trial or to impeach the witness if their story changes. Depositions can last from one hour to several days, depending on the complexity of the case and the witness's role.
No judge present: A deposition is not a court hearing. There is no judge ruling on objections in real time, and the judge will rarely read the transcript before trial. The attorneys do most of the talking. Your lawyer may object, but the objection usually does not prevent you from answering — except for privilege.
How to Prepare in the Days Before
- Meet with your attorney at least once Your lawyer will walk you through the likely topics, the documents the other side may show you, and the key points you need to communicate consistently.
- Review every document you have on the matter Refresh your memory. You will be shown contracts, emails, and notes, and asked about specifics. Skim them in advance so you can testify accurately without guessing.
- Identify the 3 to 5 facts that matter most Most witnesses try to tell everything. The best witnesses stay focused on a small number of clear, accurate points and repeat them consistently.
- Practice answering questions out loud Have your attorney ask the hardest questions and practice short, accurate answers. The goal is to be precise, not to perform.
- Get a good night of sleep Depositions can run for hours. Fatigue causes mistakes. Eat before the deposition and bring water.
The Rules That Apply in the Room
- Tell the truth — every answer is under oath, and perjury in a deposition is a crime
- Listen to the entire question before answering — do not start talking until you understand what was asked
- Answer only what was asked — do not volunteer additional facts, speculate, or guess
- If you do not know, say so — "I do not know" or "I do not recall" is a complete and acceptable answer
- Do not estimate or guess at numbers — vague answers are used to impeach witnesses later
- Pause before answering difficult questions — gives your attorney time to object if needed and gives you time to think
- Ask to see documents before answering questions about them — you have the right to refresh your recollection with a document you previously reviewed
- Do not bring notes, drafts, or anything you are not supposed to have — opposing counsel will ask what you brought and why
Frequently Asked Questions
How long does a deposition typically last?
Most depositions last 2 to 7 hours for a single witness, though complex commercial cases or expert witness depositions can run multiple days. The length depends on the importance of the witness, the number of documents involved, and the strategy of the questioning attorney.
Can I refuse to answer a deposition question?
Generally no, unless the answer would violate a recognized privilege (attorney-client, spousal, etc.), the question is asked in bad faith, or the question seeks information outside the scope of discovery. Your attorney can object, but in most cases you must still answer. If you believe a question is improper, pause and consult your lawyer before answering.
What happens if I make a mistake during my deposition?
Minor errors can often be corrected with the witness's attorney providing a written errata sheet within 30 days of receiving the transcript. Substantive mistakes are harder to fix, but a credible witness who acknowledges an honest mistake is generally more persuasive than one who tries to deny what was said.
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